Question

what is theory of reversibility​

Answer 1

theory of reversibility means the going back of light ray as it comes initially

Answer 2

1) all physical laws and phenomena are permanently reversible,

2) all physical laws are derived from the reversible M-theory (extension of string theory) in the reversible multiverse, and

3) temporary irreversible entropy increase is allowed through reversibility breaking, symmetry breaking, and low entropy beginning